<template>
  <div class="com-container">
    <div class="com-chart" ref="hotRef"></div>
    <span class="iconfont arr-left" @click="toLeft" :style="comStyle"
      >&#xe6ef;</span
    >
    <span class="iconfont arr-right" @click="toRight" :style="comStyle"
      >&#xe6ed;</span
    >
    <span class="cat-name" :style="comStyle">{{ catName }}</span>
  </div>
</template>

<script>
export default {
  data() {
    return {
      chartInstance: null,
      allData: null,
      titleFontSize: 0,
      currentIndex:0
    };
  },
   created () {
    // 在组件创建完成之后 进行回调函数的注册
    this.$socket.registerCallBack('hotData', this.getData)
  },
  computed: {
      catName () {
      if (!this.allData) {
        return ''
      } else {
        return this.allData[this.currentIndex].name
      }
    },
     comStyle () {
      return {
        fontSize: this.titleFontSize + 'px',
        // color: getThemeValue(this.theme).titleColor
      }
    },
  },
  mounted() {
    this.initChart();
    // this.getData();
    this.$socket.send({
      action: 'getData',
      socketType: 'hotData',
      chartName: 'hot',
      value: ''
    })
    window.addEventListener("resize", this.screenAdapter);
    this.screenAdapter();
  },
  destroyed() {
    window.addEventListener("resize", this.screenAdapter);
    this.$socket.unRegisterCallBack('hotData')
  },
  methods: {
    initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.hotRef);
      const initOption = {
          title: {
          text: '▎ 热销商品的占比',
          left: 20,
          top: 20
        },
        legend: {
          top: '15%',
          icon: 'circle'
        },
        tooltip: {
          show: true,
        //   formatter: arg => {
        //     console.log(arg)
        //     const thirdCategory = arg.data.children
        //     // 计算出所有三级分类的数值总和
        //     let total = 0
        //     thirdCategory.map(item => {
        //       total += item.value
        //     })
        //     let retStr = ''
        //     thirdCategory.map(item => {
        //       retStr += `
        //       ${item.name}:${parseInt(item.value / total * 100) + '%'}
        //       <br/>
        //       `
        //     })
        //     return retStr
        //   }
        },
        series: [
          {
            type: 'pie',
            label: {
              show: false
            },
            emphasis: {
              label: {
                show: true
              },
              labelLine: {
                show: false
              }
            }
          }
        ],
      };
      this.chartInstance.setOption(initOption);
    },
    getData(res) {
      // const { data: res } = await this.$http.get("hot");
      this.allData = res;
      console.log(res);
      this.updateChart();
      this.screenAdapter();
    },
    updateChart() {
      const legendData = this.allData[this.currentIndex].children.map((item) => {
        return item.name;
      });
      const serData = this.allData[this.currentIndex].children.map((item) => {
        return {
          name: item.name,
          value: item.value,
        };
      });
      const dataOption = {
        legend: {
          data: legendData,
        },
        series: [
          {
            data: serData,
          },
        ],
      };
      this.chartInstance.setOption(dataOption);
    },
    screenAdapter() {
      this.titleFontSize = (this.$refs.hotRef.offsetWidth / 100) * 3.6;
      const adapterOption = {
        title: {
          textStyle: {
            fontSize: this.titleFontSize,
          },
        },
        legend: {
          itemWidth: this.titleFontSize,
          itemHeight: this.titleFontSize,
          itemGap: this.titleFontSize / 2,
          textStyle: {
            fontSize: this.titleFontSize / 2,
          },
        },
        series: [
          {
            radius: this.titleFontSize * 4.5,
            center: ['50%', '60%']
          }
        ]
      };
      this.chartInstance.setOption(adapterOption);
      this.chartInstance.resize();
    },
    toLeft(){
         this.currentIndex--
      if (this.currentIndex < 0) {
        this.currentIndex = this.allData.length - 1
      }
      this.updateChart()
    },
    toRight () {
      this.currentIndex++
      if (this.currentIndex > this.allData.length - 1) {
        this.currentIndex = 0
      }
      this.updateChart()
    }
  },
};
</script>

<style lang="scss" scoped>
.arr-left {
  position: absolute;
  left: 10%;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
  color: red;
}
.arr-right {
  position: absolute;
  right: 10%;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
  color: red;
}
.cat-name {
  position: absolute;
  left: 80%;
  bottom: 20px;
  color: red;
}
</style>